Draft-rigging.



W. H. MINER.

DRAFT meme.

. APPLICATION FILED IAN. 2, 1917. ,300,447, Patented Apr. 15,1919.

. 2 SHEETS-SHEET I. I

' NVENTORI WITNESSES: I

W N Wujer I BY 5v M ,;7m/ I W M We K M Y WA TTORNEY W. H. MINER.

DRAFT meme.

ATION FILED JAN. 2. I917.

Patented Apr. 15,1919.

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IN V EN TOR.

BY A

TORNEY K WITNESSES:

WILLIAM H. MINER, 0F CHAZY, NEW YORK.

DRAFT-BI G-GIN G.

To all whom it may concern: 1 Be it known that I, WILLIAM H. Mrmm, a citizen ofthe United States, reslding at Chazy, in the county of Clinton and State of New York, have invented a certain new and useful Improvementin Draft-Rlgglng, of which the following is a full, clear, conc1se, and exact description, reference be ng had to the accompanying drawings, formmg a part of this specification. This invention relates to an improvemen in draft rigging.

One object of the invention is to provide a employed an expansible friction shell.

Another object of the invention is to pro vide a friction gear employing a friction shell formed by a plurality of levers and wherein the expansion of the shell is resisted by a spring arrangement transversely to the axis of the gear.

Another object of the'invention ls-to provide a friction gear employing an expansible friction shell, which shell is longitudinally movable and carries with it the means for resisting expansion'thereof.

In the drawing forming a part of this specification, Figure 1 is a part elevational, part longitudinal section of a draft rigg ng showing my improvements in connectlon therewith, the section being taken substantially along the center line of the gear. Fig.

2 is a horizontal sectional view of the struc-- ture illustrated in Fig. 1 and taken on the line 22 thereof. Fig. 3 is' a transverse, vertical sectional view taken on the line 3--3 of Fig. 1. Fig. 4 is a detail perspective of the wedge employed with the gear. And

Fig. 5 is a detail perspective of one of-the levers employed to make the expansible friction shell.

In said drawing, 10-10 denote channel center or draft sills, to the inner faces of which are secured the usual rear stops 11 and front stops 12. The draw bar 13 is operatively connected with the gear, hereinafter described, by a yoke 14 and all the 7 parts are supported by means of a detachable saddle plate 15.

The improved gear, as shown, comprises a hollow rectangular band or fulcrum member 10; a pair of levers 17; a wedge 18; a longitudinally arranged spring 19 consisting of two coils; a transversely arrangedspring 20'; a rear follower 21; and a front follower 22, the latter being formed integrally with Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filed January 2, 1917. Serial No. 140,085.

the wedge 18. The hollow fulcrum member 16 is provided on the inner faces of its side walls with rounded ribs or fulcrums 2323, the adjacent portions of said side walls being/beveled or .tapered forwardly thereof, as indicated at 24-24. Each of the levers 17 is provided on its outer face, near the front end thereof with a recess 25 corre sponding in shape and size to the fulcrum ribs 23. Forwardly of the pivot points of the levers above described, the levers areprovided with interior beveled friction faces 26 with which cooperates the corresponding inclined side faces 2727 of the wedge 18. Each of the levers 17 is provided with upper and lower inwardly extending flanges 28* and 29, thus forming a substantially hollow rectangular friction shell at the forward end thereof and affording a suitable guide and support for the wedge-18. At the rear of the fulcrums of the levers 17 and intermediate the ends thereof, said levers 17 are provided with transversely extending Walls or partitions 30-80 forming a seat for the longitudinally arranged spring 19, the forward end of the latter bearing against the spring follower 31.

At their extreme rear ends, the levers 17 are provided with inwardly turned extensions 3232 which, together with the walls 30-30 form pockets to receive and center 20. On their outer faces, the rear ends of the levers 17 are provided with rounded friction surfaces 3333 which cooperate with correspondingly formed friction surfaces 3434 on the front face of the rear follower 21.

The position of the parts in normal condition is shown in the drawing. Upon inward movement of the draw bar, the wedge 18 will be forced into the mouth of the friction cylinder thus spreading the forward ends of the levers l7 and expanding thefriction shell. This spreading movement of the forward ends of the levers, which are of the first class, is resisted by the transversely arranged spring 20, as will be apparent. Not only is capacity thus provided, but in addition, friction is created between the rear ends of the levers and the rear follower. In addition to the resistance thus offered to the wedge 18, the latter is'additionally resisted in its inward movement by the spring 19. Upon release of the pressure, the spring 19 will force the wedge 18 outwardly and siinultaneously, the spring 20 acting through the levers 17 will assist msqueezing out the wedge. The operation in draft will be apparent from being understood that the wedge 18 will remain stationary and all of the other parts of the gear move forwardly.

and .rear stops secured to their inner faces,

of front and rear followers cooperable with said stops, an expansible friction shell including pivoted levers, and mounted between said followers, wedging-means for expandin said shell upon relative approach of the fo lowers, a pair of springs, one for resist ing expansion of said shell and the other for resistingmovement of the wedging means, said springs, shell and wedging means being disposed between the sills.

2. In a gear of the character described, the combination with front and rear followers and an expansible friction shell, of a transversely arranged spring for resisting expansion of said shell, a wedge directly actuated by one of said followers for effecting the expansion of said shell, and additional spring means for directly resisting movement of said wedge relatively to the shell, said springs, wedge and shell beinglocated between said followers.

the combination with a longitudinally'movable fulcrum member, of a plurality of horizontally extending levers-pivotally mounted on the interior of said member, means for separating said levers at one end, and yieldable means for resisting approaching movement of said levers at the opposite ends.

4. In a gear of the character described,

the preceding description, 1t

the combination with a longitudinally and bodily movable expansible friction shell, of wedge means for expanding said shell, a

transversely arranged spring carried by and movable with said shell for resisting expansion thereof, and an additional spring carried by and always movable with said shell J for directly resisting relative movement between said wedging means and the shell.

5. In a gear of the character described,

the combination with a hollow rectangular member, of a pair of first class levers extending'horizontally and fulcrumed on the interior of said member, a wedge for separating said levers at one end, and a transversely arranged spring for resisting approaching movement of the levers at the opposite end.

6. In a gear of the character described,

the combination witha plurality of levers,

of a member upon which said levers are fulcrumed, means for separating the ends of said levers at one end, yieldable means for resisting approaching movement of the levers at the o posite end, and a follower, said levers and ollower having frictionally engaging surfaces, and stops with which {said follower engages.

7. In a gear of the character described, the combination with front and rear followers, of a bodily movable hollow fulcrum member,.a pair of levers fulcrumed on the interior of said member, a wedge'movable in unison with one of said followers for separating said levers at one end, a longitudinally arranged spring mounted within and carried by said levers for. resisting relative,

, longitudinal movement between the wedge v3. In a gear of the character described,

and levers, a transversely arranged spring at the end of said levers opposite to that at which the wedge is located, and cooperating friction surfaces on the ends of said levers and the other of said followers.

In witness that I claim the foregoing I have hereunto subscribed my name this 20th day of Dec., 1916.

I v WILLIAM H. MINER. 

